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학술대회 Distributed Uplink Reception for D2D Underlaid C-RAN Systems With Fronthaul Constraints
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김준범, 유대성, 최인경, 홍승은, 박석환
Vehicular Technology Conference (VTC) 2018 (Fall), pp.1-5
17HH2300, 초연결 네트워킹 미래 원천기술 연구, 유태환
This work studies distributed uplink reception for a device-to-device (D2D) underlaid cloud radio access network (C-RAN) system, in which cellular user equipments (UEs) communicate with a baseband processing unit (BBU) through a set of distributed remote radio heads (RRHs) that are connected to the BBU via finite-capacity fronthaul links. The uplink of C-RAN system is interfered by a number of D2D communication links that operate in the same frequency band. Most of prior works on C-RAN uplink systems prescribe that the noise signals of different RRHs do not have statistical correlation. However, in the D2D underlaid C-RAN uplink systems, the effective noise signals that contain the D2D interference signals may have inter-RRH cross correlation. This work proposes an improved distributed reception scheme which leverages the noise correlation information. To tackle non-convex sum-rate maximization problem, a successive convex approximation (SCA) based iterative algorithm is derived that guarantees monotonically non-decreasing sum-rates. Some numerical results are presented that validate the advantages of the proposed scheme.
beamforming, C-RAN, D2D, distributed compression, fronthaul quantization
KSP 제안 키워드
Cloud radio, Cloud-RAN(C-RAN), Communication link, Cross-Correlation, D2D communication, Device to Device(D2D), Distributed Compression, Distributed reception, Noise correlation, Non-convex, Numerical results